AirHint found the following cheapest return flights from Portland (PDX) to Buenos Aires (EZE) in December 2025 (see full year).
Return flights
| 14 Dec - 21 Dec | Alaska Airlines | ||
| 04 Dec - 28 Dec | Alaska Airlines | ||
| 04 Dec - 31 Dec | Alaska Airlines | ||
| 18 Dec - 08 Jan | Frontier Airlines |
Also check the deals for one-way flights from Portland to Buenos Aires in December.
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